Insert Nut Screw-in Type Insertion Jig for Slotted Products / IR-00S 1 piece I opened the case, but it has not been used. Part number: IR-05S Screw diameter: For M5 [Quoted from the website] Only for use with slotted products. Applicable part numbers: IRB-SW, IRB-SCW, IRU-SW, IRB-S, IRB-SC, IRU-S How to use Insert the slotted product specific jig into the slot of the slotted product and screw it in. (Same usage as a regular flathead screwdriver) Note: However, a regular flathead screwdriver cannot be inserted because the width does not match. * The tip metal part is secured with a hexagon socket set screw. It can be replaced when worn. Replacement part number for the tip metal part: IR-00R (See the table above) Note: There are two types of inner diameters for the resin handle: [1] for M2.6, M3, M4 [2] for M5, M6, M8. The tip metal part can be replaced for each.